/*
 * Our own header, to be included before all standard system headers.
 */
#ifndef _APUE_H
#define _APUE_H

#define _POSIX_C_SOURCE 200809L

#if defined(SOLARIS) /* Solaris 10 */
#define _XOPEN_SOURCE 600
#else
#define _XOPEN_SOURCE 700
#endif

#include <sys/types.h> /* some systems still require this */
#include <sys/stat.h>
#include <sys/termios.h> /* for winsize */
#if defined(MACOS) || !defined(TIOCGWINSZ)
#include <sys/ioctl.h>
#endif

#include <stdio.h>  /* for convenience */
#include <stdlib.h> /* for convenience */
#include <stddef.h> /* for offsetof */
#include <string.h> /* for convenience */
#include <unistd.h> /* for convenience */
#include <signal.h> /* for SIG_ERR */

#define MAXLINE 4096 /* max line length */

/*
 * Default file access permissions for new files.
 */
#define FILE_MODE (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)

/*
 * Default permissions for new directories.
 */
#define DIR_MODE (FILE_MODE | S_IXUSR | S_IXGRP | S_IXOTH)

typedef void Sigfunc(int); /* for signal handlers */

#define min(a, b) ((a) < (b) ? (a) : (b))
#define max(a, b) ((a) > (b) ? (a) : (b))

/*
 * Prototypes for our own functions.
 */
char *path_alloc(size_t *); /* {Prog pathalloc} */
long open_max(void);        /* {Prog openmax} */

int set_cloexec(int); /* {Prog setfd} */
void clr_fl(int, int);
void set_fl(int, int); /* {Prog setfl} */

void pr_exit(int); /* {Prog prexit} */

void pr_mask(const char *);           /* {Prog prmask} */
Sigfunc *signal_intr(int, Sigfunc *); /* {Prog signal_intr_function} */

void daemonize(const char *); /* {Prog daemoninit} */

void sleep_us(unsigned int);               /* {Ex sleepus} */
ssize_t readn(int, void *, size_t);        /* {Prog readn_writen} */
ssize_t writen(int, const void *, size_t); /* {Prog readn_writen} */

int fd_pipe(int *); /* {Prog sock_fdpipe} */
int recv_fd(int, ssize_t (*func)(int,
                                 const void *, size_t)); /* {Prog recvfd_sockets} */
int send_fd(int, int);                                   /* {Prog sendfd_sockets} */
int send_err(int, int,
             const char *);    /* {Prog senderr} */
int serv_listen(const char *); /* {Prog servlisten_sockets} */
int serv_accept(int, uid_t *); /* {Prog servaccept_sockets} */
int cli_conn(const char *);    /* {Prog cliconn_sockets} */
int buf_args(char *, int (*func)(int,
                                 char **)); /* {Prog bufargs} */

int tty_cbreak(int);               /* {Prog raw} */
int tty_raw(int);                  /* {Prog raw} */
int tty_reset(int);                /* {Prog raw} */
void tty_atexit(void);             /* {Prog raw} */
struct termios *tty_termios(void); /* {Prog raw} */

int ptym_open(char *, int); /* {Prog ptyopen} */
int ptys_open(char *);      /* {Prog ptyopen} */
#ifdef TIOCGWINSZ
pid_t pty_fork(int *, char *, int, const struct termios *,
               const struct winsize *); /* {Prog ptyfork} */
#endif

int lock_reg(int, int, int, off_t, int, off_t); /* {Prog lockreg} */

#define read_lock(fd, offset, whence, len) \
    lock_reg((fd), F_SETLK, F_RDLCK, (offset), (whence), (len))
#define readw_lock(fd, offset, whence, len) \
    lock_reg((fd), F_SETLKW, F_RDLCK, (offset), (whence), (len))
#define write_lock(fd, offset, whence, len) \
    lock_reg((fd), F_SETLK, F_WRLCK, (offset), (whence), (len))
#define writew_lock(fd, offset, whence, len) \
    lock_reg((fd), F_SETLKW, F_WRLCK, (offset), (whence), (len))
#define un_lock(fd, offset, whence, len) \
    lock_reg((fd), F_SETLK, F_UNLCK, (offset), (whence), (len))

pid_t lock_test(int, int, off_t, int, off_t); /* {Prog locktest} */

#define is_read_lockable(fd, offset, whence, len) \
    (lock_test((fd), F_RDLCK, (offset), (whence), (len)) == 0)
#define is_write_lockable(fd, offset, whence, len) \
    (lock_test((fd), F_WRLCK, (offset), (whence), (len)) == 0)

void err_msg(const char *, ...); /* {App misc_source} */
void err_dump(const char *, ...) __attribute__((noreturn));
void err_quit(const char *, ...) __attribute__((noreturn));
void err_cont(int, const char *, ...);
void err_exit(int, const char *, ...) __attribute__((noreturn));
void err_ret(const char *, ...);
void err_sys(const char *, ...) __attribute__((noreturn));

void log_msg(const char *, ...); /* {App misc_source} */
void log_open(const char *, int, int);
void log_quit(const char *, ...) __attribute__((noreturn));
void log_ret(const char *, ...);
void log_sys(const char *, ...) __attribute__((noreturn));
void log_exit(int, const char *, ...) __attribute__((noreturn));

void TELL_WAIT(void); /* parent/child from {Sec race_conditions} */
void TELL_PARENT(pid_t);
void TELL_CHILD(pid_t);
void WAIT_PARENT(void);
void WAIT_CHILD(void);

#endif /* _APUE_H */
